Doubt in report Program

Question

I need to understand why logic for two movement type elements 9N7, both with storage Location “AFFL” and C__WERKS = U001. please see code below are mapped differently  .Answer is somewhere in this block…just I am getting lost within all those case/if/when conditions…  Can anyone  tell me which fiels in which tables I need to check to determine what makes those two movement types differently mapped…
FORM F2392_MOVEMENT_9N7.
*---For reversal movement types
  IF T_MSEG-BWART EQ C_MT_9N8
  OR T_MSEG-BWART EQ C_MT_9Q8.
    T_MSEG-MENGE = T_MSEG-MENGE * ( -1 ) .
  ENDIF .
*--Check the receving plants/Storage location to determine the correct
bucket
*--If the storage loc eq 'CUST' or 'NAFF' or 'NREV'then the key fig will
be Customer shipment and the Geography will be the country of REC Plan
  IF   T_MSEG-UMLGO EQ C_SLOC_CUST
    OR T_MSEG-UMLGO EQ C_SLOC_NAFF
    OR T_MSEG-UMLGO EQ C_SLOC_NREV.
  get country of receving  plant
    PERFORM F2306_GET_PLANT_CTRY USING T_MSEG-UMWRK T_SPIACTUALS-LAND1.
    T_SPIACTUALS-CUSTDEM = T_MSEG-MENGE.
*---If the Storage location eq 'AFFL' .
  ELSEIF T_MSEG-UMLGO EQ C_SLOC_AFFL.
    CASE T_MSEG-UMWRK .
transaction at  CA Controlling Plant
      WHEN C_WERKS_4835.
*--Use the OSB Order and identify the country
        SELECT SINGLE LAND1
                    INTO ZCXXAOSBCTRYCODE-LAND1
                    FROM ZCXXAOSBCTRYCODE
                    WHERE ZISOCNTRY EQ T_MSEG-BKTXT+7(3).
These are south bound transactions and as per the info from business
folks all the postings are Interplants and Canada never delivered
to a US customer from last 2 years.
        IF SY-SUBRC EQ 0 .
          T_SPIACTUALS-LAND1   = ZCXXAOSBCTRYCODE-LAND1 .
        ELSE .
          T_SPIACTUALS-LAND1   = C_US .
        ENDIF .
        T_SPIACTUALS-DISTDEM = T_MSEG-MENGE.
      WHEN C_WERKS_U001 .
        IF NOT T_MSEG-XBLNR IS INITIAL .
          SELECT SINGLE KUNNR
          INTO LIKP-KUNNR
          FROM LIKP
          WHERE VBELN EQ T_MSEG-XBLNR .
          IF SY-SUBRC EQ 0 .
            IF LIKP-KUNNR+0(1) EQ C_P .
              T_SPIACTUALS-DISTDEM = T_MSEG-MENGE.
  PERFORM F2306_GET_PLANT_CTRY USING LIKP-KUNNR+1(4) T_SPIACTUALS-LAND1.
            ELSE .
              T_SPIACTUALS-CUSTDEM = T_MSEG-MENGE.
        PERFORM F2331_GET_CUST_CTRY USING LIKP-KUNNR T_SPIACTUALS-LAND1
                                                                  SPACE.
            ENDIF .
          ENDIF .
        ELSE.            "If no Delivery number in the mat header doc
          T_SPIACTUALS-DISTDEM = T_MSEG-MENGE .
          T_SPIACTUALS-LAND1   = C_US.
        ENDIF .
      WHEN OTHERS .
*--Verify this default with Business
        T_SPIACTUALS-DISTDEM = T_MSEG-MENGE .
        T_SPIACTUALS-LAND1   = C_US.
    ENDCASE.
  ENDIF.
ENDFORM.                    " F2392_MOVEMENT_9N7

Answer 1

Looking at your code, i have noticed you are displaying session before the request session itself, as shown below.
out.print("Old Session<br>");
out.print("session value"+session+"<br>");
session = request.getSession();   //line 10try this and tell us whats' is happening;
out.print("Old Session<br>");
session = request.getSession();
out.print("session value"+session+"<br>");also i have notice you are testing for null session, while your aim is to display current session else a new one.
i think you should be testing if the session already exist like this;
//if session already exist -  display session value
if(session !=  null) {
    out.print("Old Session<br>");
    session = request.getSession();   //line 10
    out.print("session value"+session+"<br>");     
//else create a new session
else {
     out.print("New Session");
     session = request.getSession();
     out.print("Session value: "+session+"<br>");
}Hoppe this helps!